Fuel rules start on page 57, 1/8 reference chart is on page 67-
Rules posted under 1/8 open are basically minimum 2525g, .21 engine w/9mm max carb bore, 8mm stinger bore, 125cc tank. I know they are planning on running INS boxes to limit noise. More rules like tires and body are listed there. A very popular body style is the Protoform T530 Lola (pn 1469).